#-*-coding:utf8-*-#
__author__ = 'play4fun'
"""
create time:15-10-25 上午11:42
"""

import cv2
import numpy as np

img = cv2.imread('../data/sudoku.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
# edges = cv2.Canny(gray,50,150,apertureSize = 3)
edges = cv2.Canny(gray,10,50,apertureSize = 3)
cv2.imshow("edges",edges)
lines = cv2.HoughLines(edges,1,np.pi/180,200)
print "Len of lines:",len(lines)
# print lines

for line in lines:
    rho,theta=line[0]
    a = np.cos(theta)
    b = np.sin(theta)
    x0 = a*rho
    y0 = b*rho
    x1 = int(x0 + 1000*(-b))
    y1 = int(y0 + 1000*(a))
    x2 = int(x0 - 1000*(-b))
    y2 = int(y0 - 1000*(a))
    cv2.line(img,(x1,y1),(x2,y2),(0,0,255),2)

# cv2.imwrite('houghlines3.jpg',img)
cv2.imshow("houghlines3.jpg",img)
cv2.waitKey(0)